IC REG SIMPLE SWITCHER TO-220-5

LM2576T-ADJ/NOPB

Manufacturer Part NumberLM2576T-ADJ/NOPB
DescriptionIC REG SIMPLE SWITCHER TO-220-5
ManufacturerNational Semiconductor
SeriesSIMPLE SWITCHER®
TypeStep-Down (Buck)
LM2576T-ADJ/NOPB datasheets
 

Specifications of LM2576T-ADJ/NOPB

Internal Switch(s)YesSynchronous RectifierNo
Number Of Outputs1Voltage - Output1.23 ~ 37 V
Current - Output3AFrequency - Switching52kHz
Voltage - Input4 ~ 40 VOperating Temperature-40°C ~ 125°C
Mounting TypeThrough HolePackage / CaseTO-220-5 (Straight Leads)
Current, Input Bias50 nACurrent, Output3 A
Current, Supply5 mAFrequency, Oscillator52 kHz
Package TypeTO-220Regulator TypeBuck (Step-Down)
Resistance, Thermal, Junction To Case2 °C/WTemperature, Operating, Range-40 to +125 °C
Voltage, Input40 VVoltage, Output1.23 to 37 V
Lead Free Status / RoHS StatusLead free / RoHS CompliantPower - Output-
Other names*LM2576T-ADJ
*LM2576T-ADJ/NOPB
LM2576T-ADJNS
  
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All Output Voltage Versions
Electrical Characteristics
Specifications with standard type face are for T
Range. Unless otherwise specified, V
= 30V for the 15V version. I
= 500 mA.
LOAD
Symbol
Parameter
DEVICE PARAMETERS
θ
Thermal Resistance
JA
θ
JA
θ
JC
θ
JA
ON /OFF CONTROL Test Circuit Figure 2
V
ON /OFF Pin
IH
V
Logic Input Level
IL
I
ON /OFF Pin Input
IH
Current
I
IL
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the
LM2576/LM2576HV is used as shown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.
Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output.
Note 5: Feedback pin removed from output and connected to 0V.
Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for the 12V and 15V versions, to force the
output transistor OFF.
Note 7: V
= 40V (60V for high voltage version).
IN
Note 8: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with
board with minimum copper area.
Note 9: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with
containing approximately 4 square inches of copper area surrounding the leads.
Note 10: If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package. Using
0.5 square inches of copper area, θ
is 50˚C/W, with 1 square inch of copper area, θ
JA
Note 11: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop
approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle
from 5% down to approximately 2%.
Typical Performance Characteristics
(Circuit of Figure 2)
Normalized Output Voltage
www.national.com
(Continued)
= 25˚C, and those with boldface type apply over full Operating Temperature
J
= 12V for the 3.3V, 5V, and Adjustable version, V
IN
Conditions
T Package, Junction to Ambient (Note 8)
T Package, Junction to Ambient (Note 9)
T Package, Junction to Case
S Package, Junction to Ambient (Note 10)
V
= 0V
OUT
V
= Nominal Output Voltage
OUT
ON /OFF Pin = 5V (OFF)
ON /OFF Pin = 0V (ON)
is 37˚C/W, and with 1.6 or more square inches of copper area, θ
JA
01147627
6
= 25V for the 12V version, and V
IN
IN
LM2576-XX
Units
(Limits)
LM2576HV-XX
Typ
Limit
(Note 2)
65
45
˚C/W
2
50
1.4
2.2/2.4
V(Min)
1.2
1.0/0.8
V(Max)
12
µA
30
µA(Max)
0
µA
10
µA(Max)
inch leads in a socket, or on a PC
1
2
1
inch leads soldered to a PC board
4
is 32˚C/W.
JA
Line Regulation
01147628